TRS:
 {      lt(0(), s(x)) -> true(),
           lt(x, 0()) -> false(),
       lt(s(x), s(y)) -> lt(x, y),
          minus(x, y) -> help(lt(y, x), x, y),
   help(true(), x, y) -> s(minus(x, s(y))),
  help(false(), x, y) -> 0()}
 Fail